I have a kindermann enlarger with a Schneider Kreuznach Componar 105 f4,5. An enlarger platform that lets me put the paper down as far as 4.5-6 foot away from the enlarger lens ( its got like four slots for the paper board ). I currently have this glass negative holder, that seems to hold upto a 6x9 frame, and has these 4 sliders that I assume will let me block light to the other frame so it just shows the frame selected. Now I'm wondering two things. 1) Is the kindermann universal enough that I could just go find a square-shaped 35mm film holder. (I've seen plenty of round ones that look like flat pans) 2) Would be ideal for me to get a different enlarger lens for the purpose of 35mm enlargement.